Method of making bobbins



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c. K. DUNLAP METHOD OF MAKING BOBBINS I Original Filed NOV. 25, 1927 2 Sheets-Sheet 2 if a; I

Planted a. 15, 1929 I UNITED STATES PATENT OFFICE CHARLES K. DUNLAP; OI HARTSVILLE, SOUTH CAROLINA, ASSIGNOR TO SONOCO PRODUCTS COMPANY, OF HARTSVILLE, SOUTH CAROLINA, A CORPORATION OF SOUTH CAROLINA.

METHOD OF MAKING BOBBINS Application filed November 25, 1927, Serial No. 235,691. 4 Renewed August 22, 1929.

The present invention relates to bobbins for use in thetextile industry as cores or supports for thread windings.

The object of the invention is, stated generally, to provide a bobbin that can be produced at a small cost and which is not only suitable for use as a shipping carrier of fine or fragile threads, such as rayon, but which can also be used without difliculty in a machine for manufacturing the thread into a fabric.

Heretofore it has been the custom of manu facturers of rayon and other fragile thread to wind the thread upon a relatively large core, usually of paper, for shipment to the --place of consumption, where it was necessary to rewind the thread on a suitable bottle bobbin or cone before it could be used in the knitting or other fabric forming machine. Some manufacturers have shipped their thread in skeins, and in these cases it was also necessary of course to wind the thread on a suitable bobbin before it could be fed into a.

machine. This rewinding is very undesirable, particularly in the case of rayon and other fragile threads, since it stretches the thread, thereby lowering its physical qualities and shortening its life. Three rewindings, for instance will practically destroy rayon.

The rewinding step heretofore found expedient can be eliminated if there can be produced economically a bobbin-that is suitable both as a charging and trans orting core for the thread and as a support or the thread in a fabric forming machine. "A bottle bobbin heretofore been produced, so 'far as I am conlcal surfaces exactly centered and co-axial and these surfaces must be truly cylindrical and conical respectively, since, due to the rapid rotation of the bobbins in use, any eccentricities of the surfaces cannot be tolerated. Another important requisite is that the joint between the conical and tubular parts be smooth, with no perceptible shoulder at the junction, line. If a shoulder is left, the thread will pile up under it in winding, which of course results in unsatisfactory unwinding at this point.

As will be clear hereinafter, the present invention produces b means of a novel method of forming an assembling the tubular. and conical members a paper bobbin which has its conical and cylindrical sur faces precisely centered and which has said surfaces smoothly merging without a per ceptible shoulder at the junction line. The invention therefore provides a paper bottle bobbin which is entirely suitable as a support for a thread package in a knitting, or other, machine, and which, due to its lightness and small cost, is a practical charging and shipping core for the use of thread manufacturers.

Referring to the accompanying draw- 1ngs:---v

' Fig, 1 is a side elevation of an apparatus suitable for reaming out the interior of the conical part of a bobbin;

Figs. 2 and 3 are sectional detail views on a larger scale, showing co-acting mem-' bers of the apparatus in different positions; Fig. 4 is a longitudinal sectional view through a cone which has been subjected to Fig. 8 is a side elevation of a finished bobbin, partly broken away to show the joint x cone for assembly with a paper tube to form a bottle paper bobbin in accordance with the present invention :Fig.' 1 shows somewhat 'diagrammatically a machine suitable for reaming out the lower ends of the cones to form therein cylindrical surfaces which are adapted to fit over and be secured upon one end of a paper tube or barrel. As shown, the operating parts of the machine are mounted on a frame or standard 10, said operating parts comprising a rotary cylindrical reamer 11 and a vertically reciprocable holder, or chuck,12. The cutter 13 of the reamer is threaded on the lower end of a hollow cylinder, or pipe 14 and has a sharp serrated cutting edge, as indicated. The pipe 14: is rotatable in vertically spaced and aligned bearings 15 and 16 which are rigid with the upper portion of standard 10, and has fixed thereon between these bearings a pulley 17. Rotation is imparted to the cutter by a belt 18 which passes around pulley 17 and overan idle guide pulleyv 19 and around a drive pulley 20 which is driven by a suitable motor (not shown).

The chuck 12 is fru'stro-conical in form and may have its lower smaller end integral with a cylinder 21. Cylinder 21 is mounted for vertical reciprocation. in a bearing 22 rigid with frame 10, and is formed with a collar 23 adapted to engage bearing 22 to limit the downward movement of the chuck. Bearing 22 is aligned with bearings 15 and 16, so that the axis of chuck 12 is maintained in exact coincidencewith the axis of reamer 11. The chuck is adapted to be raised by a foot lever 24 which is fulcrumed at 25 on the base of upright 10. This lever is connectedby a link 26 to one arm of a lever 27, the other arm of which is bifurcated and slotted to receive pins projecting laterally from the lower end of pipe 21. The chuck is biased to the lower position shown in Fig. 1 by gravity or by a suitable spring or by both.

A cone previously wound by known methods and preferably one which has had its exterior surface'ground and finished in accordance with the method describedin my Patent 1,634,492.is placed in chuck 12, as shown in Fig. 1. The interior conical surface of the chuck is of such dimensions that when the cone is seated therein the lower end of the cone will project very slightly within the pipe 21, as indicated in Fig.2. With the cone thus. positioned and the cutter 13 rapidly rotating, the operator depresses the foot lever 24 and thereby raises the chuck with the cone therein to the position shown in Fig. 3. In moving to this position the cutter reams out the lower end of the cone, formin Fig. 3, and therefore produces a very sharp feather edge at the small end of the cone. The nose or apex of the cone, severed by the reaming operation, may be blown out through the lower end of pipe 21 by an air blast delivered from a tube 30 which extends down through pipe 14 to apoint adjacent the cutter, or maybe removed by a suitable mechanical means. When the reaming operation is finished, the operator releases lever 24, which permits the chuck to drop away from the reamer so that the cone may be removed from the chuck and another inserted.

The cone prepared in accordance with the above method is adapted for assembly with the cylindrical part, or barrel, to form. the finished bottle bobbin. It it important, and indeed essential, that the barrel be in precise co-axial position with respect to the cone in the finished bobbin, since in use the bobbins are rotated at a high rate and any eccentricity or angularity of the axes of these parts would renderthe bobbins useless.

Figs. 5, 6 and 7 illustrate an apparatus which is adapted to v assemble the parts of the bobbin in such a way as to insure an exact centering thereof.-

The operating parts of this apparatus are mounted on a frame F, and comprise a stationary arbor 31 and a reciprocable chuck 32. Arbor 31 may consist of a metal cylinder secured in vertical position on an offsetpart 33 of frame 30. The upper portion of this cylinder has a reduced diameter substantially equal to the interior diameter of the cylindrical portion, or barrel of the bobbin, an

annular shoulder 'being formed at the junction of this upper portion with the lower portion of the cylinder, the Width of the shoulder being equal to the thickness of the barrel, so

that when a barrel is placed over the reduced upper portion of the arbor its lower edge will rest on said shoulder. The chuck 32 consists of a cylinder cored out to form an upper cylindrical part 34: and a lower frustro-conical part 35 adapted respectively to receive the cylindrical and frustro-conical portions of the .bobbins. The chuck is cored out very accurately so that the cylindrical and conical portions thereof are exactly co-axial and are adapted to form a nice fit with the corresponding portions of the bobbins. Chuck 32 is attached to a stem 36 which is guided for reciprocation in vertically spaced and aligned bearings 37 formed on an offset portion of frame 30, the chuck being thus supported and of a link 38, the upper end of which is pivotally connected to a pin 39 secured to a crank The paper tube 52 constituting the barrel of the bobbin is formed in accordance with face of the prepared cone.

any suitable method. It should have its exterior surface as nearly cylindrical as possible and of a diameter equal to the diameter of the cylindrical interior surface in the lower end of the cone to which it is to be fitted. The upper, or outer end of the tube is crimped inwardly in order to present a rounded upper end which will not interfere with the unwinding of the thread.- A tube thus formed is placed in a suitable gluing apparatus, which spreads a thin uniform layer of glue around that end of the tube remote from the rounded end, and of a width about equal to the cylindrical interior sur- The crimped end of the tube is now thrust into the large end of the cone 28 and through the cylindricalbore at the small end thereof, and the tube 52- is placed over the arbor 31, as shown in Fig. 6. The operator now depresses foot lever 49, which throws in clutch 47 and drivesshaft 41 through one revolution, whereupon the clutch is thrown out and the shaft stopped. The revolution of shaft 41 of course moves the chuck 32 down from the position shown in Fig. 6 to the position shown in Fig. 7 and then returns it to the former position. In the downward movement, cone 28 first seats on the conical surface of the chuck and then on continued downward movement the cone is forced over the tube to the position shown in Fig. 7, which is the limit of the downward movement of the chuck. In this position the cylindrical bore in the small end of the cone is over the glued end of the tube.

The assembling operation is now complete, and when the chuck moves back to its u er position, the bobbin may be removed rom the arbor and the operation repeated. This method of assembly insures a very accurate centerin of the tube and cone portions of the bobbms, as these portions are ri 'dly held in co-axial positions by the accurate y ground surfaces 34 and 35 during the assembling operation. It is to be noted that since the cone 28 is slid over the tube 52 towards the glued end, any excess of lue will be squeezed out at the interior of t e bobbin and none will escape to the outer surface of the bobbin. By this method of manufacture a paper bottle bobbin is produced in which the barrel and cone are perfectly co-axial and in which the exterior conical surface merges smoothly with the cylindrical surface with no shoulder at the joint.

The machines employed may of course be varied considerably in details of construction as the novel method can be practiced by means of apparatus, the designs and arrangement of the component elements of which may be quite different from that shown and described by way of example.

Having thus described the invention, what is claimed as new and'desired to be secured by Letters Patent is:

1. The method of joining a paper frustroconical member to a paper tubular member to form a bottle bobbin, which consists in forming an interior cylindrical surface in the small end of the frustro-conical member which meets the conical surface in a sharp feather edge and has a diameter equal to the exterior diameter of the tubular member, applying glue to the exterior surface of the tubular member at one end thereof, placing the frustro-conical member over the other end of said tubular member and then while maintaining said members co-axial forcing the tubular member through the frustroconical member until the glued end of the tubular member is engaged with the cylindrical bore in the frustro-conical member.

2. The method of preparing a paper cone for assembly withv a cylinder in the fabrication of a bottlebobbin comprising, removing the nose by a cutting operation, the cutter being introduced within the core from the large end thereof and being moved axially toward the small end to form a cylindrical axial cut entirely through the wall of the cone, the exterior surface of the cone lying opposite the out being supported against displacement during the cutting operation.

In testimony whereof I hereunto aflix my signature.

CHARLES K. DUNLAP. 

